Processing Device Swing Start Time Detection
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Solution Overview
Problem
Existing swing analyzers struggle to accurately detect the moment a user starts swinging a striking member, such as a golf club, due to potential false detections from impacts caused by movements other than swinging.
Innovation Solution
A processing device that determines the swing start time by identifying the most recent period before the impact time where the signal difference is less than a second determination value for a reference time period, using a sensor attached to the striking member to detect deformation and differentiate between swinging and non-swinging movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a determination value is set on the basis of signal value to detect swing start time, then the detection sensitivity is improved, but false detection from non-swinging movements increases
Solution Approach 1:
The patent applies preliminary action by detecting the impact time (when the club head strikes the ball) before identifying the swing start time. The system first establishes a reference period based on the impact time, then searches for the swing start time within this predefined window, ensuring that only movements leading to actual impact are detected as valid swings.
Solution Approach 2:
The system uses feedback by continuously monitoring the sensor signal during the reference period and adjusting the swing start time identification based on the detected impact time. The determination value is dynamically applied within the context of the reference period, allowing the system to distinguish between genuine swing movements and accidental movements based on whether they lead to impact.
2Measurement precision
If the detection threshold is lowered to capture all movements, then the detection sensitivity increases, but the reliability of swing detection decreases
Solution Approach 1:
The patent establishes a reference period based on impact time detection before identifying swing start time. This preliminary action creates a temporal window that filters out movements occurring outside the swing context, allowing the system to use lower thresholds within this window without increasing false detections from non-swinging movements.
Solution Approach 2:
The system applies local quality by using different detection criteria within different time periods. Within the reference period (which is locally defined based on impact time), the system uses a determination value that is sensitive to swing movements. Outside this period, movements are not considered valid swing starts, effectively creating a localized detection zone with optimized sensitivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The processing device accurately identifies the swing start time by minimizing false detections, ensuring precise analysis of the user's swing motion.
Implementation Method 1
a sensor that is attached to a striking member for striking a to-be-struck object by being swung and that detects deformation of the striking member when the striking member is swung
Data Source
AI summary
A processing device includes an operation circuit that determines based on a first signal a swing start time, the first signal being acquired from a sensor that is attached to a striking member for striking a to-be-struck object by being swung and that detects deformation of the striking member when the striking member is swung. An absolute value of a difference between a reference value and a value of the first signal is defined as a first difference value. The operation circuit executes a first determination step in which an impact time is determined based on one or more times at which the first difference value becomes greater than or equal to a first determination value.